MongoDB C100DBA Exam Practice Test Instant Access

Question 1

Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.

AMulti-statement transactions

BJoins

CAuthentication

Answer : A, B

Question 2

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

ASharding

BProperly defined user roles

CReplication

DPut indexes on all of your documents

EThe proper storage engine

Answer : C

Question 3

Which of the following is a valid insert statement in mongodb? Select all valid.

Adb.test.push({x:2,y:'apple'})

Bdb.test.insert'x':2, 'y':'apple'})

Cdb.test.insert({x:2,y:'apple'})

Ddb.test.insert({x:2},{y:'apple'})

Answer : B, C

Question 4

To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

Aupdate users collection and restart mongodb

BAll of the above

Cupdate users collection and restart mongodb with -auth option

Dupdate users collection and run db.enableAuthenticationQ

Answer : C

Question 5

Which of the following command is used to get all the indexes on a collection?

Adb.collection.showIndexes()

Bdb.collection.findlndexes()

Cdb.showIndexes()

Ddb.collection.getlndexesQ

Answer : D

Question 6

As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match:

AProviding these parameters in any order does not impact the performance

B$sort moves before $match

CMongoDB does not do any movements by default and will use the order provided

D$match moves before $sort

Answer : D

Question 7

What does the following $slice query return using the following command? db.posts.find( {}, { comments: { $slice: [ -10, 5 ] } } )

MongoDB C100DBA MongoDB Certified DBA Associate Exam Practice Test